COVERING CHAIN STITCH SEWING MACHINE FOR HEM BLIND OVER EDGING WITH SEWING SLIPPAGE PREVENTING DEVICE

摘要

PROBLEM TO BE SOLVED: To prevent sewing failures such as sewing slippage reliably by detecting in advance the occurrence of a location displacement in the lower-side part of cloth to be subjected to hem blind over edging and the presence of a deformed part due to a sewing error.;SOLUTION: A folded width guide 7 and a cloth edge guide 8 are opposed to each other at a location in the front of a needle location 6. A sewing slippage detecting sensor 10 to detect the presence or absence of sewing slippage by detecting the location of the edge W1a of the lower-side part W1 of folded cloth is provided on the side of the cloth edge guide 8. When the amount of sewing slippage detected by the sensor 10 exceeds the allowable amount of sewing slippage, it is determined that there is a possibility of sewing slippage, and an announcing means is operated for announcement.;COPYRIGHT: (C)2000,JPO